Understanding the Compromise between Strength and Exfoliation Corrosion in High Strength 7000 Alloys

Abstract:

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The microstructural evolution has been investigated in three alloys of the 7000 series possessing increasing zinc contents by combining small-angle X-ray scattering, differential scanning calorimetry and transmission electron microscopy, in order to gain understanding on the evolution of the compromise between yield strength and corrosion resistance. We show that the three materials show qualitatively identical precipitation sequences; however the precipitated volume fraction is shown to increase in parallel to the Zn content. Moreover, the precipitate size evolution is faster in the high Zn alloy. The precipitate composition is inferred to vary in the three materials, and this difference is shown to explain the differences in calorimetric behavior, precipitation kinetics and corrosion resistance.

Info:

Periodical:

Materials Science Forum (Volumes 519-521)

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd

Pages:

455-460

DOI:

10.4028/www.scientific.net/MSF.519-521.455

Citation:

T. Marlaud et al., "Understanding the Compromise between Strength and Exfoliation Corrosion in High Strength 7000 Alloys", Materials Science Forum, Vols. 519-521, pp. 455-460, 2006

Online since:

July 2006

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Price:

$35.00

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